almost a success, help help!

Ok so as far as completing my 2013 Sewlution that went into Karen's Jar is concerned, i'd say this is a success! i wrote that i wanted to do something fully-lined, which i've never done before. well i did it! a dress with a full lining! i wrapped my brain around it and inserted my invisible zip in between the lining and the main fabric and it looks pretty awesome. 

but i'm having issues with the fit. it's close, but not quite right. if i hold still and stand perfectly it looks pretty good, but when i relax and wait a few minutes, then the issues become apparent. not a success. so i took a bunch of bathroom mirror shots (sorry, but i promise if you help me get the fit right, i'll do a full-on outdoor photoshoot). what should i do? 

the fit around the bust and shoulders is good. and i haven't hemmed up the bottom yet so when i do that, it will help balance the proportions (i left it extra long for now - it goes a little past my knees) and i haven't sewn up the bottom of the skirt yet below the zipper. it's pretty snug around the waist. i wouldn't want it any tighter, but i can breath with it the way it is, plus i can't let it out there. i saw that it might be a little tight there, so i already sewed the seam allowance narrower around the waist. well except for the darts, i guess i could let those out at the bottom a little? but then right above the waist it's loose. 

so, do i pinch out the excess in the side seams? 

or do i just raise the waist up? 

or do i do a bit of both? 

or something else entirely?

here are the photos:

standing straight and it looks ok at first…

and then relax and it gets all bunchy

bunchy view from the front

do i raise the waist up?

do i just pinch out the sides?

excess fabric around the middle and lower back (back of skirt below zip hasn't been sewn up yet)

dress inside out, full lining from the front

dress inside out, full lining from the back

yeah yeah yeah, i should've done a muslin. maybe next time. but this fabric was super cheap (on sale 50% off. actually the lining cost more than the main fabric, ha ha ha). and confession, now i think i sewed the back left skirt panel on backwards!  see how the lining fabric doesn't come together in the back? well i can't tell the front from the back of this ivory lining fabric and i think i got it backwards on the left side. i had it marked, but then probably got confused because the "good side" faces in toward my body and the "wrong side" faces out toward the main dress fabric. but it's just the lining, so i'll either fix it or add a little extra panel if needed. but the main fabric for the skirt does comes together perfectly in the back.

focusing on the positive: i feel like i made a huge leap in understanding linings and now i want to fully line everything. it feels so much more polished. 

but how do i fix the bunchy areas? any ideas or tips? help help!